The feature is not quite ready for getting ClusterFuzzed.

BUG=v8:5516

Change-Id: I90a42f950727c8ecf46cb2987c9a459b2ba1f5a7
Reviewed-on: https://chromium-review.googlesource.com/480400
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44693}